Motor-operated razor



April 14, 1925.

L. A. MAYNARD' MOTOR QPERATED RAZOR Filed March 13 1924 fet PatentedApr. 14, 1925i.

UNITED STATES LAUBIER A. HAYN'ARD,

0F DE'QROIT, MICHIGAN.

MOTOR-OPERATED Application filed March 13, 1924. Serial No. 899,050.

To @ZZ 'whom t may concern.'

Be it known that I, LAURIER A. MAYNARD,

a citizen of the United States, residing at Detroit, in the county-of'Wayne and State of Michigan, have invented certain new and usefulImprovements in Motor-Operated Razors, of which the following is aspeciiication, references being had therein to the accompanyingdrawings.

rllhis invention relates to motor operated razors and my invention aimsto provide a novel power transmission mechanism by which a razor blademay be -rapidly reciprocated from the power provided by an electricmotor or other source .of power to which the power transmissionmechanism is articulated so that the razor may be freely manipulatedrelative to a face.' It is in lthis connection, that the powertransmission mechanism is housed within ahandle member of the razor `andprovision is made whereby easy access may be had to the transmissionmechanism for lubricatingor repair purposes.

My invention further aims to provide a x power razor wherein a drivencam is adapted to oscillate crank shafts and cause said shafts toosoillate or reciprocate a razor blade 'which is provided with ayieldable guard adapted to contact with the face and crowd the fleshhead of the blade so that' the flesh will be stretched to facilitatingthe cutting of hair by the razor blade.

My invention will be hereinafter specically described in the claims, andreference will now be had to the drawing,

wherein- Fi re 1 is a side elevation of the razor showing the handleportion thereof in longitudinal section;

Fig. 2 is a plan of the razor partly 1n section on the line II-II of'Fig. 1;

Fig. 3 is a cross sectional View ofthe razor taken on the line III-IIIof Fig. 1;v

Fi 4 is a similar view taken on the line IV- V of Fig.' 1;

Fig. 5 is a slmilar view taken on the line VV-V of Fig. 1;

Fig. 6 is a, view of the outer end of the razor blade showing the guard;

Fi 7 is a erspective view of a detached coup ing mem er, and

Fi 8 is a perspective view of a detached double crank.

In the drawing, the reference numeral 1 denotes an oblong handleprovided with a.

anti-frietional bearing 'finger ring or hole 2, and said handle issubstantially. hollow with the upper portion thereof affording a barrel3 and the lower portion thereof a casing 4, said casing havingadetachable side wall 5 that may be held in place by screws 6.

The outer end of the handle or barrel is provided with a detachablescrew plug 7 that may be held against accidental rotation by a set screw8 and in said plug is an 9, in the form of a ball for the enlarged end10 of a driven cam shaft 11 which is journaled in a bore A12 formed in.the inner end of the handle 1.

The bore 12 1s enlarged to receive a sleeve 13 held in place by a setscrew 14 and mounted in the sleeve is the iexible casing 15 of' aflexible drive shaft 16 suitably connected to the cam shaft 11, as at17. The flexible shaft 16 is adapted to be driven fromv an electricmotor or other source of power with the casing 15 of sufficient lengthto permit of the handle l being freely ma` nipulatd relative to thesource of power.

The handle 1 at the bore 12, has an annular recess 18 foranti-frictional bearings 19, preferably balls, against which bear acollar 20 on the cam shaft 11, so that the l anti-frictional .bearings19 may cooperate with the bearing 9 in holding the. cam shaft againstanyend thrust or longitudinal move-A ment.

Mounted in the detachable side wall 5 andV 26 of a two-part couplingmember 27 which has its parts connected together by a. set screw 28. Theparts of the coupling member are formed with recesses 29 forantifrictional bearings 30 and extending between said 'anti-frictionalbea-rings is a disk or cam 31carried by the cam shaft 11. The cam is inthe form of a disk set at an angle, other than a right angle, to the camshaft 11 whereby the disk will serve as a, cam when Athe shaft 11 isdriven, thus causing the coupling member 27 to be shifted back and forthto im art a rocking movement to the double cran s 22.

The outer end wall of the casing 4 has an opening 32 and extendingthrough said opening into the casing 4 is the vshank 33 of a.

las

sanitary razor blade 34. The shank 33 is pivotally mounted between thearms 24 of the double cranks 22 by ins 35 and in consequence of thisconnection the blade 34 may have a reciprocatory movement impartedthereto from the driven cam shaft 11. The blade 34 is of a conventionalform that may be stropped, but I equip said blade with a guard 36disposed parallel tothe cutting edge of the blade and Iadapted to swingto either side of the plane of said blade. The guard is-in the form of arigid piece of wire having its outer end provided with a pintle 37loosely mounted in a bracket 38 attached to the back of the blade 34 bya set screw 39 or other fastening means.

On the shank 33, adjacent the end of the blade 34 is a strap 40embracing the shank 33 with inturned lugs 41 extending 'underthe shankand retained in engagement therewith by a bracket( 42 and a set screw43. The strap 40 also has resilient opposed arms `44 between whichextends the inner angular pintle end 45 ofthe guard 36-with the pintleoosely mounted in the bracket 42 which cooperates with the bracket 38 inpivotally supporting theguard. so/that by pressure it may be swung tothat side of the razor blade. The resilient arms 44 hold the guard 36normally in the plane of the blade 34, as best shown in Figs. 5 and 6,but when the razor blade isgplaced against the face the guard isswungout of the plane of the blade and stresses the resilient arm 44which it engages. This particularly stressed resilient arm will producea pressure on the guard against the face and consequently as the razorblade'is advanced over the face the uard will crown the iiesh head ofthe hanle and edge of the razor blade, smoothing out the skin so thatthe reciprocatory blade may readily attack the hair on the face.Assuming that the blade is reasonably sharp it is obvious that its fastmotion will cause hairs -to be quickly severed and the guard 36 willcontribute towards a close shave.

From the foregoing it will be observed that I have housed within therazor handle a compact p'wer transmission mechanism by which a rotarymotion may be converted into a reciprocatory motion, thus causing therazor blade to be driven and reciprocated from a flexible power shaft.By removing the detachable side wall the mechanism can be lubricated andmaintained in an operatable condition and since such mechanism is at aoint remote from the blade 34 there is no anger of the mechanismbecoming unor interfering with stropping of the razor blade. Then again,the power transmission mechanism is such that the razor blade is notexactly reciprocated in a linear direction but describes an arc whichapproaches the sweeping action of drawing a razor blade over the face.This is a thing desired in connection with anygpower razorl 1. In apower razor, a handle, a razor blade having a shank extending into saidhandle, a flexible shaft extendinglintf` said handle, and powertransmission mechanism 1n said handle operated from saidilexible vshaftand adapted to oscillate said razor blade, said power transmission meansincluding a cam shaft, cranks supporting the f,

razor blade shank, and a coupling memb'er articulating said cranks andactuated by said cam shaft.

2.. Means for reciprocating a` razor blade having a shank, comprisingcrank shafts supporting the blade by its shank, a coupling memberarticulating said crank shaftsand means engaging said coupling member tocause oscillation thereof.

3. Razor blade -reciprocating means as called for in claim 2, whereinthe last mentioned means includes adriven cam shaft.

4. Razor blade reciprocating means as called for in claim 2, whereinsaid coupling member contains anti-frictional bearings' and the lastmentioned means extending between said bearings.

5. A power razor comprising a. casing, a.

blade having a shank extending into saidl casing, -a barrel adjoiningsaid casing, a drlven cam shaft extending into said barrel, and means insaid casing supporting the shank of said blade and actuated from saidcam shaft adapted for reciprocating said blade.

6. A power razor as called for in claim 5, wherein said means includescranks connected by a coupling member actuated by said cam shaft.

7. A power razor comprising a handle, a. driven shaft extending into theinner end of said handle, a blade having a shank extending into theouter end of said handle and parallel with said shank, and spaced apartrocking means in said handle solely1 supporting the blade shank andarticulating said shaft and blade shank so that said shaft may causeoscillation of said blade.

8. In a power razor, a handle, a blade having a vshank extending intosaid handle, and

wer transmission means in said handle articulated with said bladeshank-for causing III lll

lll

CII

l un oscillatory movement of said blade, said power transmission meansincluding double cranks supporting saidblade shank 9. A power razoreonlprising a handle, a blade having a shank in said handle, a powershaft extending into said handle parallel to the blade shank, a powertransmission means between said power shaft and said blade shank tosupport and guide the movement-.of the entireblade and shank in similararcuated paths of like amplitude.

10. A power razor comprising a handle, a blade having a shank in saidhandle, a

power shankextending into said handle and adapted to transmit power tosaid blade shank, and means effecting an endwise motion of theblade'tlirough an arc with vthe lin presence of two witnesses.

LAURIER A. MAYNARD.

Witnesses:

LEWIS E. FLANDERS, ANNA M. DoRR.

